Airframe Mechanic Certification Aircraft Fuel Systems 3

Question 1

What safety procedure must be performed before opening an aircraft fuel system for maintenance?

Accepted Answer

Bond and ground the aircraft to prevent static discharge and follow all fuel safety precautions

Answer

Disconnect only the aircraft battery to prevent sparks

Answer

Apply preservative oil to all fuel fittings before disconnecting

Answer

Pressurize the fuel system to identify leaks first

Question 2

What inspection is required for a fuel tank after it has been repaired or resealed?

Accepted Answer

A pressure test to verify fuel-tight integrity and structural soundness

Answer

A visual inspection of the exterior seams only

Answer

An ultrasonic thickness test of all tank walls

Answer

A dye penetrant inspection of all interior seams

Question 3

How often must fuel strainers and filters be inspected and cleaned according to FAA regulations?

Accepted Answer

At each 100-hour or annual inspection and per manufacturer's maintenance schedule

Answer

Only when a fuel system malfunction is detected

Answer

Every 500 hours regardless of manufacturer guidance

Answer

Once per year during the annual inspection only

Question 4

What is 'misfueling' and what is a common serious consequence?

Accepted Answer

Putting the wrong type of fuel in an aircraft, which can cause engine failure or serious damage

Answer

Overfilling a tank beyond capacity, causing only minor fuel spillage

Answer

Failing to refuel before flight, leading to fuel starvation in flight

Answer

Mixing two approved brands of the same fuel type, with no safety consequence

Question 5

What must be verified when replacing a fuel cap on a certificated aircraft?

Accepted Answer

The replacement cap must be an approved part identical to or compatible with the original per the maintenance manual

Answer

Any cap of the same thread diameter may be installed

Answer

Fuel caps do not require specific part number matching

Answer

A generic automotive fuel cap may substitute temporarily in field conditions

Question 6

What regulation governs fuel system airworthiness design requirements for certificated aircraft?

Accepted Answer

14 CFR Part 23 or Part 25, depending on aircraft category

Answer

14 CFR Part 91 — General Operating and Flight Rules

Answer

14 CFR Part 65 — Certification of Airmen

Answer

14 CFR Part 43 — Maintenance, Preventive Maintenance, Rebuilding, and Alteration

Question 7

What does a fuel system pressure check after maintenance involve?

Accepted Answer

Pressurizing the fuel system to specified limits and inspecting all connections, seals, and fittings for leaks

Answer

Running the engine at full power while monitoring fuel flow gauges

Answer

Checking fuel tank quantity with all caps removed

Answer

Verifying the fuel selector moves smoothly through all positions